﻿// Spun AJAX Framework
// Copyright (C) 2008 Blake Hegerle
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Spun.Models.Sequences
{
    public class FixedSequence<T> : Sequence<T>
    {
        public FixedSequence(uint Size)
            : this(Size, true)
        { }

        public FixedSequence(uint Size, bool ThrowIfCountSet)
            : base(typeof(FixedSequence<T>), false, false)
        {
            Array = new T[Size];
            this.ThrowIfCountSet = ThrowIfCountSet;

            for (var i = 0u; i < Count; i++)
                AddMember(MakeModelMember(i));

            Update("Count", Count);
        }

        public override uint Count
        {
            get
            {
                return (uint)Array.Length;
            }
            set
            {
                if (ThrowIfCountSet)
                    throw new NotImplementedException("Cannot change the length of a FixedSequence");
            }
        }

        public override T this[uint Index]
        {
            get
            {
                return Array[Index];
            }
            set
            {
                Array[Index] = value;
                Update(ModelMemberName(Index), value);
            }
        }

        public override IEnumerator<T> GetEnumerator()
        {
            foreach (T Item in Array) yield return Item;
        }

        private T[] Array;
        private bool ThrowIfCountSet;
    }
}
